mirror of
https://github.com/gravitational/teleport.git
synced 2026-11-01 21:52:02 +08:00
David Boslee
32695a2f05
This adds proxy peering support. A configurable setting that allows for agents to connect to a subset of proxies and be reachable through any proxy in the cluster. This is achieved by creating grpc connections between each proxy server. Client connections can then be passed between proxies to the desired agent.
78 lines
2.0 KiB
Go
78 lines
2.0 KiB
Go
// Copyright 2022 Gravitational, Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package proxy
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import (
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"context"
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"sync"
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"github.com/gravitational/trace/trail"
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"google.golang.org/grpc"
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)
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// streamWrapper wraps around the embedded grpc.ClientStream
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// and intercepts the RecvMsg method calls decreading the number of
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// streams counter.
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type streamWrapper struct {
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grpc.ClientStream
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wg *sync.WaitGroup
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once sync.Once
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}
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func (s *streamWrapper) CloseSend() error {
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err := s.ClientStream.CloseSend()
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s.decreaseCounter()
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return err
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}
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func (s *streamWrapper) SendMsg(m interface{}) error {
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err := s.ClientStream.SendMsg(m)
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if err != nil {
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s.decreaseCounter()
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}
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return err
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}
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func (s *streamWrapper) RecvMsg(m interface{}) error {
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err := s.ClientStream.RecvMsg(m)
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if err != nil {
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s.decreaseCounter()
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}
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return err
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}
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func (s *streamWrapper) decreaseCounter() {
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s.once.Do(func() {
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s.wg.Done()
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})
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}
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// streamCounterInterceptor is GPRC client stream interceptor that
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// counts the number of current open streams for the purpose of
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// gracefully shutdown a draining grpc client.
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func streamCounterInterceptor(wg *sync.WaitGroup) grpc.StreamClientInterceptor {
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return func(ctx context.Context, desc *grpc.StreamDesc, cc *grpc.ClientConn, method string, streamer grpc.Streamer, opts ...grpc.CallOption) (grpc.ClientStream, error) {
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s, err := streamer(ctx, desc, cc, method, opts...)
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if err != nil {
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return nil, trail.ToGRPC(err)
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}
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wg.Add(1)
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return &streamWrapper{
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ClientStream: s,
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wg: wg,
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}, nil
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}
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}
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